<!--category模块：一级分类基础布局 -->
<template>
    <div class="top-category">
        <div class="container">
            <!-- 面包屑 -->
            <XtxBread>
                <XtxBreadItem to="/">首页</XtxBreadItem>
                <XtxBreadItem>{{ topCategory.name }}</XtxBreadItem>
            </XtxBread>
            <!-- 轮播图 -->
            <XtxCarousel :silders="silders" style="height: 500px;"></XtxCarousel>
            <!-- 所有二级分类 -->
            <div class="sub-list">
                <h3>全部分类</h3>
                <ul>
                    <li v-for="item in topCategory.children" :key="item.id">
                        <a href="javascript:;">
                            <img :src="item.picture">
                            <p>{{ item.name }}</p>
                        </a>
                    </li>
                </ul>
            </div>
            <!-- 分类关联商品 -->
            <div class="ref-goods" v-for="item in subList" :key="item.id">
                <div class="head">
                    <h3>- {{ item.name }} -</h3>
                    <p class="tag">{{ item.desc }}</p>
                    <XtxMore />
                </div>
                <div class="body">
                    <GoodsItem v-for="g in item.goods" :key="g.id" :goods="g" />
                </div>
            </div>
        </div>
    </div>
</template>
<script>
import { findBanner } from '@/api/home';
import { ref, computed, watch } from 'vue';
import { useRoute } from 'vue-router';
import { useStore } from 'vuex';
import GoodsItem from './components/goods-item.vue'
import { findTopCategory } from '@/api/category'

// 获取轮播数据 
const getSilders = () => {
    const silders = ref([])
    findBanner().then(data => {
        silders.value = data.result
    })
    return { silders }
}
// 用route.params.id与vuex中的list数据比较 获取匹配的数据 所有分类
const useTopCategory = (route) => {
    const store = useStore()
    const topCategory = computed(() => {
        let cate = {}
        const item = store.state.category.list.find(item => {
            return item.id === route.params.id
        })
        if (item) cate = item
        return cate
    })
    return { topCategory }
}
// 获取推荐商品
const useSubList = (route) => {
    const subList = ref([])
    const getSubList = () => {
        findTopCategory(route.params.id).then(data => {
            subList.value = data.result.children
        })
    }
    return { getSubList, subList }
}
// watch监听
const useWatch = (route, getSubList) => {
    watch(() => route.params.id, (newVal) => {
        if (newVal && `/category/${newVal}` === route.path) getSubList()
    }, { immediate: true })
}
export default {
    name: "TopCategory",
    components: {
        GoodsItem
    },
    setup() {
        const route = useRoute()

        const { silders } = getSilders()

        const { topCategory } = useTopCategory(route)

        const { subList, getSubList } = useSubList(route)

        useWatch(route, getSubList)

        return { silders, topCategory, subList }
    }

}
</script>
<style lang="less" scoped>
.top-category {
    h3 {
        font-size: 28px;
        color: #666;
        font-weight: normal;
        text-align: center;
        line-height: 100px;
    }

    .sub-list {
        margin-top: 20px;
        background-color: #fff;

        ul {
            display: flex;
            padding: 0 32px;
            flex-wrap: wrap;

            li {
                width: 168px;
                height: 160px;

                a {
                    text-align: center;
                    display: block;
                    font-size: 16px;

                    img {
                        width: 100px;
                        height: 100px;
                    }

                    p {
                        line-height: 40px;
                    }

                    &:hover {
                        color: @xtxColor;
                    }
                }
            }
        }
    }

    .ref-goods {
        background-color: #fff;
        margin-top: 20px;
        position: relative;

        .head {
            .xtx-more {
                position: absolute;
                top: 20px;
                right: 20px;
            }

            .tag {
                text-align: center;
                color: #999;
                font-size: 20px;
                position: relative;
                top: -20px;
            }
        }

        .body {
            display: flex;
            justify-content: flex-start;
            flex-wrap: wrap;
            padding: 0 65px 30px;
        }
    }
}
</style>